PLANT CALIBRATION

TESTING

·Frequency – Pipe Testing in Accordance with the Requirements of
IM 445

·Frequency – Absorption Testing

·Frequency – Gradation Testing

MARKING & IDENTIFICATION

·Markings/Stamping – Class, design, plant ID, date of manufacture,
and trademark should be plainly marked or stenciled on the inside of the pipe
near the tongues no later than 24 hours after the pipe or the precast unit is
made.